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Faking a JPEG

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291 points todsacerdoti | 1 comments | 11 Jul 25 22:57 UTC | HN request time: 0.422s | source
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puttycat ◴[12 Jul 25 02:01 UTC] No.44538667[source]▶
> compression tends to increase the entropy of a bit stream.

Does it? Encryption increases entropy, but not sure about compression.

replies(2): >>44538728 #>>44538745 #
1. gregdeon ◴[12 Jul 25 02:16 UTC] No.44538745[source]▶
Yes: the reason why some data can be compressed is because many of its bits are predictable, meaning that it has low entropy per bit.